New England Opens a Wholesale Route for Small Batteries and Flexible Loads

Small batteries, solar systems and flexible loads can now register together to enter New England’s wholesale power markets. ISO New England opened registration on November 1, giving aggregations as small as 100 kW a route to compete alongside larger resources. An aggregator registers the group and represents it in the market.

The opening reaches an electricity market where the hour of delivery matters. Ask the Grid’s study of October 28–November 3 found average real-time prices in the Northeast Massachusetts/Boston zone of $29.07/MWh at midday and $47.31/MWh in the evening. All eight load zones showed an evening premium over the same windows. Those are existing market prices; the study does not measure the new aggregations’ effect on them.

New England already had thousands of megawatts of larger distributed resources participating in its markets, according to the operator’s November 2 announcement. Some smaller systems could not meet the size or performance requirements alone. Aggregation lets those devices combine their capabilities under a single market participant.

The resources remain connected to local distribution networks. The new framework can accommodate rooftop solar, batteries, thermal storage, demand response and electric vehicles with controllable charging. Their market role depends on what they can do: inject power, withdraw it, reduce consumption or help balance the system.

In Boston, the mean price for 5–9 p.m. exceeded the 11 a.m.–3 p.m. mean by $18.24/MWh. An aggregation able to shift consumption or stored energy between those periods would face different wholesale energy values. The chart also shows a morning rise; flexible resources need an operating schedule, rather than a single daily price, to understand their opportunity.

A battery’s usable energy, charging losses and customer backup reserve limit what it can deliver. Flexible demand has its own timing and operating constraints. Energy-price differences therefore describe the market setting; actual earnings also depend on dispatch, metering, the participation model and other costs.

The implementation rules distinguish registering from activation. Settlement-only aggregations undergo an eligibility review of up to 60 days. An aggregation of 5 MW or more at a single node must participate as a standalone resource or through a more geographically restricted aggregation. The rules preserve a connection between where a resource sits and how it participates.

The next evidence to watch is the number of activated aggregations, their qualified MW and their measured response when called. Those observations will show how much of New England’s existing small-resource base takes up the new route—and which hours it can reliably serve.